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Zhang K, Zhang T, Lv QY, Han Y, Cai T, Gu FM, Gu ZX, Zhao JY, Liang JY, Gao M, Gao YF, Hu R, Cui D, Li B, Liu K. U-shaped association between serum calcium and in-hospital mortality in diabetes patients with congestive heart failure: a cohort study. Sci Rep 2024; 14:13412. [PMID: 38862553 PMCID: PMC11167038 DOI: 10.1038/s41598-024-63603-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 05/30/2024] [Indexed: 06/13/2024] Open
Abstract
Previous studies have reported that the significant association between serum calcium and mortality substantially in patients, especially among those with intensive care unit (ICU). And In diabetes mellitus, congestive heart failure (CHF) is a significant comorbidity. We aim to evaluate the association between serum calcium levels and in-hospital mortality among patients with diabetes and congestive heart failure. The participants in this study were extracted from the Medical Information Mart for Intensive Care IV (MIMIC-IV) database. To scrutinize potential associations between serum calcium levels and in-hospital mortality, a comprehensive analysis encompassing multivariate logistic regression, cubic spline function model, threshold effect analysis, and subgroup analysis was performed. This retrospective cohort study encompassed 7063 patients, among whom the in-hospital mortality stood at 12.2%. In the multivariate logistic regression, adjusted odds ratios (ORs) were contrasted with the reference category Q6 (8.8-9.1 mg/dL) for serum calcium levels and in-hospital mortality. The adjusted ORs for Q1 (≤ 7.7 mg/dL), Q2 (7.7-8 mg/dL), and Q7 (≥ 9.1 mg/dL) were 1.69 (95% CI 1.17-2.44, p = 0.005), 1.62 (95% CI 1.11-2.36, p = 0.013), and 1.57 (95% CI 1.1-2.24, p = 0.012) respectively. The dose-response analysis uncovered a U-shaped relationship between serum calcium levels and in-hospital mortality in diabetic patients with heart failure. Subgroup analyses confirmed result stability notwithstanding the influence of diverse factors. Our investigation revealed a U-shaped correlation between serum calcium levels and in-hospital mortality in diabetes patients with congestive heart failure, pinpointing a significant inflection point at 9.05 mg/dL.
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Affiliation(s)
- Kai Zhang
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China.
| | - Tianqi Zhang
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Qian Yu Lv
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Yu Han
- Department of Ophthalmology, First Hospital of Jilin University, Changchun, China
| | - Tianyi Cai
- Department of Ophthalmology, Second Hospital of Jilin University, Changchun, China
| | - Fang Ming Gu
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Zhao Xuan Gu
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Jia Yu Zhao
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Jia Ying Liang
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Min Gao
- Department of Cancer Center, The First Hospital of Jilin University, Changchun, China
| | - Ya Fang Gao
- Department of Ophthalmology, Second Hospital of Jilin University, Changchun, China
| | - Rui Hu
- Department of Ophthalmology, Second Hospital of Jilin University, Changchun, China
| | - Dan Cui
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Bo Li
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China
| | - Kexiang Liu
- Cardiovascular Surgery Department of Jilin University Second Hospital, No. 218, Ziqiang Street, Changchun, Jilin Province, China.
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Guan B, Yang M, Shen X, Wang Y, Liu Y, Liu R, Li S, Cao J. Genetically determined serum bilirubin level and the risk of heart failure: A mendelian randomization study. Front Genet 2023; 14:1067146. [PMID: 36713081 PMCID: PMC9881886 DOI: 10.3389/fgene.2023.1067146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 01/02/2023] [Indexed: 01/14/2023] Open
Abstract
Background: The association between serum bilirubin level and heart failure (HF) was controversial in previous observational studies and the causal effects of bilirubin on HF have not been investigated. Here, we conducted a Mendelian randomization (MR) study to investigate the associations between genetically determined bilirubin level and HF. Methods: Summary data on the association of single nucleotide polymorphisms (SNPs) with serum bilirubin levels were obtained from genome-wide association study (GWAS) for individuals of European descent and East Asian descent separately. Statistical data for gene-HF associations were extracted from three databases: the HERMES Consortium (47,309 cases and 930,014 controls), FinnGen study (30,098 cases and 229,612 controls) for European population and Biobank Japan (2,820 HF cases and 192,383 controls) for East Asian population. We applied a two-sample Mendelian randomization framework to investigate the causal association between serum bilirubin and HF. Results: Findings from our MR analyses showed that genetically determined serum bilirubin levels were not causally associated with HF risk in either European or East Asian population (odds ratio [OR] = 1.01 and 95% confidence interval [CI] = .97-1.05 for HERMES Consortium; OR = 1.01 and 95% CI = .98-1.04 for FinnGen Study; OR = .82, 95% CI: .61-1.10 for Biobank Japan). These results remained unchanged using different Mendelian randomization methods and in sensitivity analyses. Conclusion: Our study did not find any evidence to support a causal association between serum bilirubin and HF.
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Affiliation(s)
- Bo Guan
- Medical School of Chinese PLA General Hospital, Beijing, China
| | - Mingyan Yang
- Medical School of Chinese PLA General Hospital, Beijing, China
| | - Xing Shen
- Department of Experimental Hematology and Biochemistry, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing, China
| | - Yemei Wang
- Jinzhou Medical University, Jinzhou, China
| | - Yutong Liu
- Medical School of Chinese PLA General Hospital, Beijing, China
| | - Ruihan Liu
- Medical School of Chinese PLA General Hospital, Beijing, China
| | - Shijun Li
- Geriatric Cardiology Department of the Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China,*Correspondence: Jian Cao, ; Shijun Li,
| | - Jian Cao
- Geriatric Cardiology Department of the Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China,*Correspondence: Jian Cao, ; Shijun Li,
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The prognostic impact of magnesium in acute heart failure is different according to the presence of diabetes mellitus. Porto Biomed J 2022; 7:e197. [PMID: 37152077 PMCID: PMC10158881 DOI: 10.1097/j.pbj.0000000000000197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 10/17/2022] [Indexed: 12/23/2022] Open
Abstract
Background Hypermagnesemia predicts mortality in chronic heart failure (HF); however, in acute HF, magnesium does not seem to be outcome-associated. Diabetes mellitus (DM) frequently associates with altered magnesium status. We hypothesized that DM might influence the prognostic impact of magnesium in acute HF. Methods This is a retrospective cohort study of hospitalized patients with acute HF. Patients without data on admission serum magnesium were excluded. Follow-up: 1 year from hospital admission. Primary end point: all-cause mortality. Patients were divided according to median serum magnesium (1.64 mEq/L). The Kaplan-Meier survival method was used to determine survival curves according to magnesium levels. The analysis was stratified according to the presence of DM. A multivariable Cox regression analysis was used to study the prognostic impact of magnesium. Results We studied 606 patients. The mean age was 76 ± 12 years, 44.1% were male, 50.7% had DM, and 232 (38.3%) died during follow-up. Median magnesium was 1.64 (1.48-1.79) mEq/L. Patients with magnesium ≥1.64 mEq/L had higher 1-year mortality [141 (46.4%) vs 91 (30.1%), P < .001]. After adjustments for age, sex, history of atrial fibrillation, systolic blood pressure, heart rate, ischemic etiology, B-type natriuretic peptide, estimated glomerular filtration rate, alcohol consumption, antihyperglycaemic agents or glycated hemoglobin, admission glycemia, New York Heart Association class IV, and severe left ventricle systolic dysfunction, serum magnesium ≥1.64 mEq/L was associated with higher mortality only in patients with DM: HR 1.89 (95% confidence interval: 1.19-3.00), P = .007, and 1.27 (95% confidence interval: 0.83-1.94) and P = .26 for non-DM patients. The results were similar if magnesium was analyzed as a continuous variable. Per 0.1 mEq/L increase in magnesium levels, patients with DM had 13% increased risk of 1-year mortality. Conclusions Higher magnesium levels were associated with worse prognosis only in HF patients with DM.
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Gorący I, Rębacz-Maron E, Korbecki J, Gorący J. Concentrations of Mg, Ca, Fe, Cu, Zn, P and anthropometric and biochemical parameters in adults with chronic heart failure. PeerJ 2021; 9:e12207. [PMID: 34760349 PMCID: PMC8567860 DOI: 10.7717/peerj.12207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 09/03/2021] [Indexed: 12/13/2022] Open
Abstract
Background The study investigated the relationship between the concentrations of Mg, Ca, Fe, Cu, Zn, P and anthropometric and biochemical parameters in the blood serum of patients with heart failure (HF) and the potential influence on the development and progression of HF. Material & methods The study included 214 patients (155 men and 59 women), aged 40–87 years, presenting symptoms or signs typical of HF (according to the NYHA functional classification). Serum concentrations were determined for Mg, Ca, Fe, Cu, Zn, P, C-reactive protein (CRP), creatinine, urea, triglyceride levels (TG), total cholesterol (CH), high density protein (HDL), low density protein (LDL). The levels of macro-and microminerals were analysed using inductively coupled serum optical emission spectrometry (ICP-OES). Results Our study confirmed the role of known risk factors in the development of heart failure, including: overweight, diabetes, hypertension, high triglycerides (TG), high total cholesterol (CH), high levels of low density protein (LDL) and reduced levels of high density protein (HDL), high CRP, high creatinine. Moreover, deficient serum concentrations of Mg (47% of the studied men and 54% of the women) and Cu (in 44% of men and more than 30% of women) were observed, as well as subnormal serum Fe (2% of women) and Zn (1% of men). Elevated serum Ca was found in 50% of men and 49% of women. In 44% of the studied men and 52% of the studied women, P levels in serum were also above-average. The study revealed a significant positive correlation between serum levels of Ca and Mg, and also Ca and Cu in women. In men, serum Cu was positively correlated with Mg and Ca concentrations. In patients from group 1 (NYHA I–II), Mg content was positively correlated with Ca and Cu. In this patient group, Ca was also positively associated with Cu content in serum. In group 2 (NYHA III-IV), serum Mg concentration was significantly positively correlated with that of Cu and Ca. Conclusions Changes in the serum concentrations of macro-and microminerals may significantly affect the severity of HF in Polish patients.
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Affiliation(s)
- Iwona Gorący
- Department of Clinical and Molecular Biochemistry, Pomeranian Medical University, Szczecin, Poland
| | - Ewa Rębacz-Maron
- Institute of Biology, Department of Ecology and Anthropology, University of Szczecin, Szczecin, Poland
| | - Jan Korbecki
- Department of Histology and Embryology, Department of Human Morphology and Embryology, Wroclaw Medical University, Wrocław, Poland
| | - Jarosław Gorący
- Clinic of Cardiology, Pomeranian Medical University, Szczecin, Poland
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Chen Y, Forgetta V, Richards JB, Zhou S. Health Effects of Calcium: Evidence From Mendelian Randomization Studies. JBMR Plus 2021; 5:e10542. [PMID: 34761146 PMCID: PMC8567492 DOI: 10.1002/jbm4.10542] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 07/23/2021] [Accepted: 08/03/2021] [Indexed: 12/24/2022] Open
Abstract
Calcium is widely used in conjunction with vitamin D to prevent osteoporosis. The use of calcium supplementation is also promoted for its potential benefits in lowering the risk for metabolic syndromes and cancers. However, the causal link between calcium and various health outcomes remains unclear. This review focuses on the evidence from 24 Mendelian randomization (MR) studies that were designed to minimize bias from confounding and reverse causation. These MR studies evaluated the effect of lifelong genetically higher serum calcium levels on various health outcomes. Overall, available MR studies found no conclusive effects of serum calcium levels on bone mineral density and fracture, ischemic stroke and heart failure, cancers, type 2 diabetes, Parkinson disease, or offspring birth weight. However, a higher serum calcium concentration was reported to have estimated causal effects on increased risks for coronary artery disease (especially myocardial infarction), migraine, renal colic, allergy/adverse effect of penicillin, and reduced risks for osteoarthrosis and osteoarthritis. In conclusion, supplementation of calcium in individuals from the general population is not predicted to influence the risk of most investigated diseases to date. Moreover, long-term high serum calcium concentrations may result in adverse health outcomes. © 2021 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Yiheng Chen
- Department of Human GeneticsMcGill UniversityMontréalQCCanada
- Lady Davis Institute, Jewish General HospitalMcGill UniversityMontréalQCCanada
| | - Vincenzo Forgetta
- Lady Davis Institute, Jewish General HospitalMcGill UniversityMontréalQCCanada
| | - J. Brent Richards
- Department of Human GeneticsMcGill UniversityMontréalQCCanada
- Lady Davis Institute, Jewish General HospitalMcGill UniversityMontréalQCCanada
- Department of Epidemiology, Biostatistics and Occupational HealthMcGill UniversityMontréalQCCanada
- Department of Twin ResearchKing's College LondonLondonUK
| | - Sirui Zhou
- Lady Davis Institute, Jewish General HospitalMcGill UniversityMontréalQCCanada
- Department of Epidemiology, Biostatistics and Occupational HealthMcGill UniversityMontréalQCCanada
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Serum calcium and 25-hydroxyvitamin D in relation to longevity, cardiovascular disease and cancer: a Mendelian randomization study. NPJ Genom Med 2021; 6:86. [PMID: 34650087 PMCID: PMC8516873 DOI: 10.1038/s41525-021-00250-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 09/23/2021] [Indexed: 12/24/2022] Open
Abstract
Associations of serum calcium (S-Ca) and 25-hydroxyvitamin D (S-25(OH)D) concentrations with longevity, cardiovascular disease, and cancer are not clear. We conducted a Mendelian randomization study to examine the associations of S-Ca and S-25(OH)D with longevity and risk of cardiovascular disease and cancer. The primary genetic instruments for S-Ca and S-25(OH)D were obtained from genome-wide association meta-analyses that included 61,054 individuals for S-Ca and up to 79,366 individuals for S-25(OH)D. Genetic variants associated with S-Ca and S-25(OH)D in the UK Biobank were used as confirmatory instruments. We obtained summary-level data for associations of these instruments with individual survival later than the 90th versus at most the 60th percentile of expected age at death from a genome-wide association meta-analysis including 11,262 cases and 25,483 controls, and with parental longevity (both parents in top 10% percentile) from the UK Biobank including 7,182 cases and 79,767 controls. Data for cardiovascular disease (111,108 cases and 107,684 controls) and cancer (38,036 cases and 180,756 controls) were obtained from the FinnGen consortium. A one standard deviation increase in genetically-predicted S-Ca concentration was associated with lower odds of longevity (odds ratio, 0.72; 95% CI, 0.55-0.95) and increased risk of cardiovascular disease (odds ratio, 1.11; 95% CI, 1.03-1.20). The associations were consistent in confirmatory analyses. There was no evidence supporting an association between genetically-predicted S-Ca and cancer, and no associations of genetically-predicted S-25(OH)D with the studied outcomes. Lifelong higher levels of S-Ca but not S-25(OH)D may shorten life expectancy and increase the risk of cardiovascular disease.
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Young WJ, Warren HR, Mook-Kanamori DO, Ramírez J, van Duijvenboden S, Orini M, Tinker A, van Heemst D, Lambiase PD, Jukema JW, Munroe PB, Noordam R. Genetically Determined Serum Calcium Levels and Markers of Ventricular Repolarization: A Mendelian Randomization Study in the UK Biobank. CIRCULATION. GENOMIC AND PRECISION MEDICINE 2021; 14:e003231. [PMID: 33887147 PMCID: PMC8208093 DOI: 10.1161/circgen.120.003231] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 04/02/2021] [Indexed: 11/16/2022]
Abstract
BACKGROUND ECG markers of ventricular depolarization and repolarization are associated with an increased risk of arrhythmia and sudden cardiac death. Our prior work indicated lower serum calcium concentrations are associated with longer QT and JT intervals in the general population. Here, we investigate whether serum calcium is a causal risk factor for changes in ECG measures using Mendelian randomization (MR). METHODS Independent lead variants from a newly performed genome-wide association study for serum calcium in >300 000 European-ancestry participants from UK Biobank were used as instrumental variables. Two-sample MR analyses were performed to approximate the causal effect of serum calcium on QT, JT, and QRS intervals using an inverse-weighted method in 76 226 participants not contributing to the serum calcium genome-wide association study. Sensitivity analyses including MR-Egger, weighted-median estimator, and MR pleiotropy residual sum and outlier were performed to test for the presence of horizontal pleiotropy. RESULTS Two hundred five independent lead calcium-associated variants were used as instrumental variables for MR. A decrease of 0.1 mmol/L serum calcium was associated with longer QT (3.01 ms [95% CI, 2.03 to 3.99]) and JT (2.89 ms [1.91 to 3.87]) intervals. A weak association was observed for QRS duration (secondary analyses only). Results were concordant in all sensitivity analyses. CONCLUSIONS These analyses support a causal effect of serum calcium levels on ventricular repolarization, in a middle-aged population of European-ancestry where serum calcium concentrations are likely stable and chronic. Modulation of calcium concentration may, therefore, directly influence cardiovascular disease risk.
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Affiliation(s)
- William J. Young
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health NHS trust (W.J.Y., M.O., P.D.L.)
| | - Helen R. Warren
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- NIHR Barts Cardiovascular Biomedical Research Unit (H.R.W., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
| | - Dennis O. Mook-Kanamori
- Department of Clinical Epidemiology (D.O.M.-K.), Leiden University Medical Center, the Netherlands
- Department of Public Health and Primary Care (D.O.M.-K.), Leiden University Medical Center, the Netherlands
| | - Julia Ramírez
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- Institute of Cardiovascular Sciences, University of College London, United Kingdom (J.R., S.v.D., M.O., P.D.L.)
| | - Stefan van Duijvenboden
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- Institute of Cardiovascular Sciences, University of College London, United Kingdom (J.R., S.v.D., M.O., P.D.L.)
| | - Michele Orini
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health NHS trust (W.J.Y., M.O., P.D.L.)
- Institute of Cardiovascular Sciences, University of College London, United Kingdom (J.R., S.v.D., M.O., P.D.L.)
| | - Andrew Tinker
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- NIHR Barts Cardiovascular Biomedical Research Unit (H.R.W., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
| | - Diana van Heemst
- Department of Internal Medicine (D.v.H., R.N.), Leiden University Medical Center, the Netherlands
| | - Pier D. Lambiase
- Barts Heart Centre, St Bartholomew’s Hospital, Barts Health NHS trust (W.J.Y., M.O., P.D.L.)
- Institute of Cardiovascular Sciences, University of College London, United Kingdom (J.R., S.v.D., M.O., P.D.L.)
| | - J. Wouter Jukema
- Department of Cardiology (J.W.J.), Leiden University Medical Center, the Netherlands
- Netherlands Heart Institute, Utrecht, the Netherlands (J.W.J.)
| | - Patricia B. Munroe
- Clinical Pharmacology Department, William Harvey Research Institute (W.J.Y., H.R.W., J.R., S.v.D., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
- NIHR Barts Cardiovascular Biomedical Research Unit (H.R.W., A.T., P.B.M.), Barts and the London School of Medicine and Dentistry, Queen Mary University of London
| | - Raymond Noordam
- Department of Internal Medicine (D.v.H., R.N.), Leiden University Medical Center, the Netherlands
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Curtis EM, Cooper C, Harvey NC. Cardiovascular safety of calcium, magnesium and strontium: what does the evidence say? Aging Clin Exp Res 2021; 33:479-494. [PMID: 33565045 PMCID: PMC7943433 DOI: 10.1007/s40520-021-01799-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 01/13/2021] [Indexed: 12/20/2022]
Abstract
Calcium, magnesium and strontium have all been implicated in both musculoskeletal and cardiovascular health and disease. However, despite these three elements being closely chemically related, there is marked heterogeneity of their characteristics in relation to cardiovascular outcomes. In this narrative review, we describe the relevant evidential landscape, focusing on clinical trials where possible and incorporating findings from observational and causal analyses, to discern the relative roles of these elements in musculoskeletal and cardiovascular health. We conclude that calcium supplementation (for bone health) is most appropriately used in combination with vitamin D supplementation and targeted to those who are deficient in these nutrients, or in combination with antiosteoporosis medications. Whilst calcium supplementation is associated with gastrointestinal side effects and a small increased risk of renal stones, purported links with cardiovascular outcomes remain unconvincing. In normal physiology, no mechanism for an association has been elucidated and other considerations such as dose response and temporal relationships do not support a causal relationship. There is little evidence to support routine magnesium supplementation for musculoskeletal outcomes; greater dietary intake and serum concentrations appear protective against cardiovascular events. Strontium ranelate, which is now available again as a generic medication, has clear anti-fracture efficacy but is associated with an increased risk of thromboembolic disease. Whilst a signal for increased risk of myocardial infarction has been detected in some studies, this is not supported by wider analyses. Strontium ranelate, under its current licence, thus provides a useful therapeutic option for severe osteoporosis in those who do not have cardiovascular risk factors.
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Affiliation(s)
- Elizabeth M Curtis
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, SO16 6YD, UK
- Rheumatology Department, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Cyrus Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, SO16 6YD, UK
- NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford, UK
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Nicholas C Harvey
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, SO16 6YD, UK.
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK.
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Abstract
PURPOSE OF REVIEW The current review describes the fundamentals of the Mendelian randomization framework and its current application for causal inference in human nutrition and metabolism. RECENT FINDINGS In the Mendelian randomization framework, genetic variants that are strongly associated with the potential risk factor are used as instrumental variables to determine whether the risk factor is a cause of the disease. Mendelian randomization studies are less susceptible to confounding and reverse causality compared with traditional observational studies. The Mendelian randomization study design has been increasingly used in recent years to appraise the causal associations of various nutritional factors, such as milk and alcohol intake, circulating levels of micronutrients and metabolites, and obesity with risk of different health outcomes. Mendelian randomization studies have confirmed some but challenged other nutrition-disease associations recognized by traditional observational studies. Yet, the causal role of many nutritional factors and intermediate metabolic changes for health and disease remains unresolved. SUMMARY Mendelian randomization can be used as a tool to improve causal inference in observational studies assessing the role of nutritional factors and metabolites in health and disease. There is a need for more large-scale genome-wide association studies to identify more genetic variants for nutritional factors that can be utilized for Mendelian randomization analyses.
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Affiliation(s)
- Susanna C Larsson
- Unit of Medical Epidemiology, Department of Surgical Sciences, Uppsala University, Uppsala
- Unit of Cardiovascular and Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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